Actually, now that I have a "Scanguage"....
http://ecomodder.com/forum/showthrea...age-14781.html
....I mucked around with some resistors in my IAT sensor yesterday. I ended up with a 136K resistance between IAT sig and sensor ground to pull the sig voltage down a bit. However, it was cold last night (5C, 23F), so without a WAI this mod is a little pointless to even try. At 5C ambient, my modified IAT showed -35C (-31F). A two way run at 71 km/h, 1475 rpm (OD, TC locked) with and without resistor (total of 4 runs) made about 0.1 L/100km difference, lowering it from 8.3 (28.3mpg) to 8.2 (28.7mpg), but that's well within error margins, so whatever. The IGN timing didn't seem to change with or without resistor, but Again, the actual intake temp was probably way too cold.
This morning I dropped my wife off at the train and it was 14C (57F) outside and my IAT showed -12C (10F). I watched the timing and the knock sensor wasn't impeding on my party. But still, 14C intake air still isn't very warm. Now that it's Fall, I should really make a WAI to get the actual IAT up to "normal" Summer temps of 25C (77F) or so.